How long did you last without yawning? The first 5 seconds? Or all the way to the end? If you gave into your yawns before the end, congratulations! You are not a psycopath. If you didn't, however, then... you might be one.

"Empathy is one of the core psychological factors that leads to catching yawns," says Psychology Today. Prior studies have noticed this same lack of empathy on children on the autism spectrum (that does not mean, however, that autistic individuals are psycopaths; it just means that they are less likely to catch a yawn).

And it wasn't just the test subjects' lack of a yawn that researchers tested. They were also tested on how easily they were startled (psycopaths lack fear). The less likely someone was startled, the less likely there were to yawn.

So, relax! Just because you didn't yawn throughout that whole video doesn't mean you'll start cooking up human flesh like Hannibal. It probably just means that you tend to be ruthless, you don't let your emotions get in the way of what you need to do, and you can easily make tough decisions.